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我在教学人教版九年级数学下册“锐角三角函数”的练习课时,选了一道2014年河南省的中考题让两位学生板演,两位学生的算法都正确,但结果不同,是什么原因呢?现把学生的解法整理如下与同行交流.(河南中考题)在中俄“海上联合—2014”反潜演习中,我军舰A测得潜艇C的俯角为30°,位于军舰A正上方1000米的反潜直升机B测得潜艇C的俯角为68°,试根据以上数据求出潜艇C离开海平面的下潜深度.(结果保留整
I was teaching PEP ninth grade mathematics book “acute angle trigonometric function ” practice class, chose a 2014 Henan province in the senior high school entrance examination questions for the two students boarding, two students algorithm is correct, but the result is different , What is the reason? Now the student's solution is organized as follows. (Henan exam questions) In the Sino-Russian “Sea Joint -2014 ” anti-submarine exercises, the warship A measured submarine C depression angle of 30 °, The anti-submarine helicopter B located 1000 meters above the warship A measured the depression angle of the submarine C as 68 °, and based on the above data, the submarine C dive depth from the sea level was obtained.